Add installation directive to pkgconfig

Author: eFrane

meson.build

@@ -115,7 +115,8 @@ pkgconfig.generate(libraries : libs,
               filebase : meson.current_build_dir()+'/oparl-'+api,
               subdirs : h,
               requires : 'glib-2.0 gobject-2.0 gio-2.0 json-glib-1.0',
-              description : 'A library to access OParl civic information endpoints.')
+              description : 'A library to access OParl civic information endpoints.',
+              install: true)
 
 install_headers(meson.current_build_dir()+'/oparl-'+api+'.h')